Bill Harken is a former FBI agent and a hyperadrenal Alpha on Rosen's team. His wife Jeannie thought he was still employed with the FBI. Bill was suspended from the Bureau after getting angry with a colleague and accidentally shoving him through a solid wall; he only planned on staying with Rosen's team until his suspension was over. He's since decided to stay on the team, even though the Bureau offered to reinstate him.

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Episode One: When we meet Bill Harken, he and his wife are talking about him having been suspended. Because his wife is wearing a FBI t-shirt that is way to big on her, this makes us think that he was suspended from the FBI and this turns out to be correct. When he walks outside to leave, he finds a large SUV blocking his drive way. He then "amps up" and pushes the SUV out of the way. His DoD Alphas Initiative file tells us that he has Enhanced Strength from his fight-or-flight response. When a man witnesses him moving the SUV and is staring at him, he gets a little aggressive and says, "Have a problem?"

Bill has the ability to enhance his strength and speed triggered by a "fight or flight" response. It is implied that he can activate this state at will. Bill cannot stay in this state for very long or else he will become cripplingly fatigued, however in "alpha dogs" Bill becomes better at using his ability thanks to Kat training him he was able to use his abilities without having any downsides and claims he doesn't need his pills anymore. Bill suffers from anger management issues. He has what Rosen describes as "boundary issues"; he routinely samples other people's food without asking permission.

Bill can also enhance the strength in his legs, enabling him to run considerably faster.

In addition to enhanced strength and speed, he also seems to become invulnerable, and only seems to respond to pain after he stops using his ability.

Bill seems to be immune to Matthew Hurley's power to make people mad.

He can stand still and take a beating from three armed men, one of whom is tasing him continuously, without moving. Partially explained by his ability to control his adrenaline rushes, as adrenaline is known to make it easier to ignore pain. The aches, pains, and injuries he must logically have collected don't seem to affect him later, either.

Though he was as ambivalent towards Gary as everyone else on the team, Bill always laughs at Gary's antics where others would fume in early episodes This provides some early indications of his later friendship with Gary following "Bill and Gary's Excellent Adventure".